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TB-9098 Page 1 of 7
© 2020 DESCO INDUSTRIES INC
Employee Owned
SCS - 926 JR Industrial Drive, Sanford, NC 27332
East: (919) 718-0000 | West: (909) 627-9634 • Website: StaticControl.com
April 2020
Description
The SCS 724 Plus Workstation Monitor continuously
monitors the path-to-ground integrity and body voltage
of two operators, as well as the path-to-ground integrity
for one conductive or dissipative worksurface. The
724 Plus Workstation Monitor eliminates the need for
periodic testing and record keeping of wrist straps.
The 724 Plus Workstation Monitor is designed with
digital signal processing technology for true continuous
monitoring (versus pulsed or intermittent) of wrist strap
functionality (path-to-ground and presence of two 1
megohm resistors) and operator safety according
to accepted industry standards. It is unaffected
by capacitance variations from personnel or the
environment. Digital signal processing technology uses
dual-wire wrist straps to apply a low test voltage of
0.40 V onto the operator for the handling of sensitive
components.
The 724 Plus Workstation Monitor features operator
body voltage detection. It will alarm if the operator
generates or comes in contact with voltage that would
be dangerous to an ESD susceptible item. Each 724
Plus Workstation Monitor is calibrated with accepted
procedures and standards traceable to the National
Institute of Standards and Technology (NIST) and
includes a certificate of calibration.
ANSI/ESD S20.20 section 7.3 states “Compliance
verification records shall be established and maintained
to provide evidence of conformity to the technical
requirements.” Per ANSI/ESD S1.1 Annex A.3 Daily
(wrist strap system) testing may be omitted if constant
monitoring used.” Per ESD Handbook ESD TR 20.20
section 5.3.2.4.4 “Typical Test programs recommend
that wrist straps that are used daily should be tested
daily. However, if the products that are being produced
are of such value that knowledge of a continuous,
reliable ground is needed, and then continuous
monitoring should be considered or even required.”
The 724 Plus Workstation Monitor and its accessories
are available as the following item numbers:
Item Description
770724 724 Plus Workstation Monitor
770732 Operator Remote, Dual
770733 Operator Remote, Workstation 2
770735 Replacement Nylong Plug for 770733
Operator Remote, Pack of 20
770065 Verification Tester
CTA212 Power Adapter, 100-240 VAC Input, 12 VDC
1.5 A Output, All Plugs
Packaging
770724 724 Plus Workstation Monitor
1 724 Plus Workstation Monitor
1 Dual Operator Remote
1 Operator Remote Cable
1 Mat Monitor Cord (White)
1 Monitor Ground Cord (Green and Yellow)
1 Countersunk Washer
1 Flat Head Screw, 6-32 x 1/4"
4 Pan Head Screw, #6 x 3/8"
1 Power Adapter, 12 VDC, with interchangeable plugs
(North America, UK/Asia, Europe)
770732 Dual Operator Remote
1 Dual Operator Remote
1 Operator Remote Cable
2 Pan Head Screw, #6 x 3/8"
770733 Workstation 2 Operator Remote
1 Workstation 2 Operator Remote
1 Operator Remote Cable
2 Pan Head Screw, #6 x 3/8"
1 Black Nylon Plug
724 Plus Workstation Monitor
Installation, Operation and Maintenance
Made in the
United States of America
USER GUIDE TB-9098
Figure 1. SCS 724 Plus Workstation Monitor
U.S. Patents 6,930,612; 9,983,251
TB-9098 Page 2 of 7
© 2020 DESCO INDUSTRIES INC
Employee Owned
SCS - 926 JR Industrial Drive, Sanford, NC 27332
East: (919) 718-0000 | West: (909) 627-9634 • Website: StaticControl.com
A. Operator 1 LED: Illuminates green when operator
1 is properly grounded and his/her body voltage level
is below the preset alarm level. Illuminates solid red
and audible alarm sounds when operator 1 is above
the resistance limit. Blinks yellow and audible alarm
sounds when operator 1 is below the resistance limit.
Blinks red and audible alarm sounds when the body
voltage on operator 1 is above the preset alarm level.
Both the Operator 1 and Operator 2 LEDs blink red
simultaneously should the operator remote become
disconnected from the monitor.
B. Mat LED: Illuminates green when the worksurface
mat is properly grounded. Illuminates red and audible
alarm sounds when the worksurface mat is not properly
grounded.
C. Operator 2 LED: Illuminates green when operator
2 is properly grounded and his/her body voltage level
is below the preset alarm level. Illuminates solid red
and audible alarm sounds when operator 2 is above
the resistance limit. Blinks yellow and audible alarm
sounds when operator 2 is below the resistance limit.
Blinks red and audible alarm sounds when the body
voltage on operator 2 is above the preset alarm level.
Both the Operator 1 and Operator 2 LEDs blink red
simultaneously should the operator remote become
disconnected from the monitor.
Features and Components
724 Plus Workstation Monitor
D. Power Jack: Connect the included 12 VDC power
adapter here.
E. Set Switch: Toggles the monitor's settings for the
audible alarm, mat monitor circuit, and operator high
test limit.
Feature Procedure
Enable / Disable
Audible Alarm
1. Push and release the switch
while the monitor is powered.
2. All 3 LEDs will cycle power.
3. A chirp from the buzzer will
indicate that the audible alarm
is enabled. No chirp will indicate
that the audible alarm is
disabled.
Enable / Disable
Mat Monitor
Circuit
1. Push and hold the switch until
all 3 LEDs illmuniate.
2. Release the switch.
3. An illuminated MAT LED
indicates that the mat
monitor circuit is enabled. A
non-illuminated MAT LED
indicates that the mat monitor
circuit is disabled.
Operator High
Test Limit -
10 megohms
1. Disconnect the monitor from
power.
2. Push and hold the switch while
restoring power to the monitor.
3. The operator LEDs will blink
green upon boot-up to indicate
a 10 megohm operator high test
limit.
Operator High
Test Limit -
35 megohms
1. Disconnect the monitor from
power.
2. Push and hold the switch while
restoring power to the monitor.
3. The operator LEDs will blink red
upon boot-up to indicate a 35
megohm operator high test limit.
F. Ground Terminal: Common ground point for the
monitor.
G. Monitored Mat Terminal: Monitors a worksurface
mat for proper dissipative resistance. Use the included
white mat monitor cord to connect the worksurface mat
to this terminal.
H. Operator Remote Jack: Use the included operator
remote cable to connect an operator remote to this
connector. The monitor will alarm should the operator
remote cable disconnect from this connector.
Figure 2. 724 Plus Worstation Monitor features and
components
A
FRONT
E
BACK
D
B C
F G H
TB-9098 Page 3 of 7
© 2020 DESCO INDUSTRIES INC
Employee Owned
SCS - 926 JR Industrial Drive, Sanford, NC 27332
East: (919) 718-0000 | West: (909) 627-9634 • Website: StaticControl.com
Dual Operator Remote
A. Monitored Operator 1 Jack: Insert the dual-wire
wrist cord of an operator here to monitor his/her body
voltage and connection to ground.
B. Power LED: Illuminates solid blue when the Dual
Operator Remote is powered.
C. Monitored Operator 2 Jack: Insert the dual-wire
wrist cord of an operator here to monitor his/her body
voltage and connection to ground.
D. Monitor / Workstation 2 Operator Remote Jack:
Use the included operator remote cable to connect the
724 Plus Workstation Monitor to this connector. The
monitor will alarm should the operator remote cable
disconnect from this connector.
Workstation 2 Operator Remote
Figure 4. Workstation 2 Operator Remote features and
components
A
FRONT
BACK
C
B
D
A. Power LED: Illuminates solid blue when the Dual
Operator Remote is powered.
B. Monitored Operator 2 Jack: Insert the dual-wire
wrist cord of an operator here to monitor his/her body
voltage and connection to ground.
C. Monitor Remote Jack: Use the included operator
remote cable to connect the 724 Plus Workstation
Monitor to this connector. The monitor will alarm
should the operator remote cable disconnect from this
connector.
D. Dual Operator Remote Jack: Use the included
operator remote cable to connect the Dual Operator
Remote to this connector. The monitor will alarm
should the operator remote cable disconnect from this
connector.
Figure 3. Dual Operator Remote features and
components
A
FRONT
BACK
D
B C
TB-9098 Page 4 of 7
© 2020 DESCO INDUSTRIES INC
Employee Owned
SCS - 926 JR Industrial Drive, Sanford, NC 27332
East: (919) 718-0000 | West: (909) 627-9634 • Website: StaticControl.com
Installation
724 Plus Workstation Monitor and Dual
Operator Remote
5. Route the operator remote cable from the back
of the 724 Plus Workstation Monitor to the Dual
Operator Remote. Connect the cable to the back of
the Dual Operator Remote.
6. Insert the tinned termination of the mat monitor cord
into the mat terminal located on the back of the 724
Plus Workstation Monitor. Use a small screwdriver
to secure the wire to the terminal block.
7. Route the mat monitor cord from the back of the
724 Plus Workstation Monitor to the grounded
worksurface mat. Use the included countersunk
washer and flat head screw to secure the cord to
the grounded mat.
NOTE: The worksurface must be connected directly
to ground without the use of a 1 megohm resistor.
Per ANSI/ESD S6.1 Section 5.2.1 Common Point
Ground:
"All of the grounding conductors from each of the
ESD technical elements (excluding level 2 technical
elements) used within an EPA shall be terminated at
the same electrically equivalent point. The common
point ground may be a terminal strip, bus bar or any
other convenient configuration that is, within itself,
electrically continuous to no greater than 1 ohm
measured from point to point with an ohmmeter as
specified in paragraph 6.1.1."
8. Insert the tinned termination of the ground cord into
the ground terminal located on the back of the 724
Plus Workstation Monitor. Use a small screwdriver
to secure the wire to the terminal block.
9. Attach the other end of the ground cord to a ground
point. The face plate screw of a grounded AC wall
outlet may provide a convenient connection point.
10. Connect the power adapter to the power jack
located on the back of the 724 Plus Workstation
Monitor. Route the wire from the supply to a nearby
AC outlet and plug it into the outlet. Make sure the
voltage and frequency match those listed on the
power supply. The 724 Plus Workstation Monitor is
now powered.
Figure 5. Installing the 724 Plus Workstation Monitor and
Dual Operator Remote
Mat Monitor Cord
724 Plus
Workstation Monitor
Grounded Worksurface Mat
Power Adapter
Operator
Remote Cable
Monitor Ground Cord
Dual Operator Remote
Countersunk
Washer
Flat Head
Screw
1. Remove the 724 Plus Workstation Monitor and its
Dual Operator Remote from the carton.
2. Determine the mounting location of the 724 Plus
Workstation Monitor. Its display should be visible to
the operator(s). Use its enclosure's mounting tabs to
secure it underneath a shelf or ledge.
3. Determine the mounting location of the Dual
Operator Remote. Its jacks should be accessible
to operators. Locate it within reach of the included
operator remote cable. Use its enclosure's
mounting tabs to secure it underneath a table top or
equipment.
4. Connect the included operator remote cable to the
dual operator remote connector located on the back
of the 724 Plus Workstation Monitor.
TB-9098 Page 5 of 7
© 2020 DESCO INDUSTRIES INC
Employee Owned
SCS - 926 JR Industrial Drive, Sanford, NC 27332
East: (919) 718-0000 | West: (909) 627-9634 • Website: StaticControl.com
Workstation 2 Operator Remote
724 Plus
Workstation Monitor
Operator
Remote Cable
Dual Operator Remote
Workstation 2
Operator Remote
Operator
Remote Cable
Figure 7. Cabling the Workstation 2 Operator Remote
to the 724 Plus Workstation Monitor and Dual Operator
Remote
When paired with the 724 Plus Workstation Monitor,
the SCS 770733 Workstation 2 Operator Remote may
be used to monitor a second operator at a nearby
independent workstation. It allows the second operator
to connect to his/her own operator remote rather than
share the Dual Operator Remote included with the 724
Plus Workstation Monitor. Use the following procedure
to add the Workstation 2 Operator Remote to an
existing 724 Plus Workstation Monitor setup.
1. Disconnect the 724 Plus Workstation Monitor from
power.
2. Determine the mounting location of the Workstation
2 Operator Remote. Its jack should be accessible
to the second operator. Locate it within reach of the
included operator remote cable. Use its enclosure's
mounting tabs to secure it underneath a table top or
equipment.
3. Connect the operator remote cables to the 724
Plus Workstation Monitor, Dual Operator Remote,
and Workstation 2 Operator Remote as shown in
Figure 7.
4. Insert the included black nylon plug into the operator
2 jack located on the Dual Operator Remote. This
will prevent operators from using this jack once the
Workstation 2 Operator Remote is installed.
NOTE: The operator 2 jack on the Dual Operator
Remote must be plugged with the nylon plug when
adding the Workstation 2 Operator Remote to the
setup. The 724 Plus Workstation Monitor will alarm
should it detect a Workstation 2 Operator Remote
and vacant operator 2 jack on the Dual Operator
Remote.
5. Reconnect the 724 Plus Workstation Monitor to
power.
Figure 8. Inserting the black nylon plug into the operator
2 jack on the Dual Operator Remote
Figure 6. SCS 770733 Workstation 2 Operator Remote
TB-9098 Page 6 of 7
© 2020 DESCO INDUSTRIES INC
Employee Owned
SCS - 926 JR Industrial Drive, Sanford, NC 27332
East: (919) 718-0000 | West: (909) 627-9634 • Website: StaticControl.com
Alarm Types
LED(s) Behavior Condition
Mat Solid red Worksurface not
grounded
Operator 1 or 2 Blinking yellow Operator below low
limit threshold
Operator 1 or 2 Solid red Operator above high
limit threshold
Operator 1 or 2 Blinking red Operator body
voltage
Operator 1 & 2 Blinking red Operator remote
disconnected
Operation
Using the Monitor
1. Fit the wristband snugly onto the wrist.
2. Snap the wrist cord to the wristband.
3. Plug the wrist cord into one of the operator jacks
on the Dual Operator Remote. The corresponding
operator LED will illuminate solid green on the 724
Plus Workstation Monitor. This indicates that the
operator is properly grounded.
4. If this does not happen, examine the wrist cord for
continuity or damage and the wristband to ensure
that it fits securely. If you have dry skin, apply an
approved dissipative hand lotion such as Menda
Reztore® ESD Hand Lotion.
Figure 9. Using the 724 Plus Workstation Monitor when
mounted underneath a surface
Figure 10. Using the 724 Plus Workstation Monitor when
mounted on top of a surface
TB-9098 Page 7 of 7
© 2020 DESCO INDUSTRIES INC
Employee Owned
SCS - 926 JR Industrial Drive, Sanford, NC 27332
East: (919) 718-0000 | West: (909) 627-9634 • Website: StaticControl.com
Calibration
Frequency of recalibration should be based on the
critical nature of those ESD sensitive items handled and
the risk of failure for the ESD protective equipment and
materials. In general, SCS recommends that calibration
be performed annually.
Use the SCS 770065 Verification Tester to perform
periodic testing (once every 6-12 months) of the 724
Plus Workstation Monitor. The Verification Tester
can be used on the shop floor within a few minutes
virtually eliminating downtime, verifying that the tester is
operating within tolerances.
Limited Warranty, Warranty Exclusions, Limit
of Liability and RMA Request Instructions
See the SCS Warranty -
StaticControl.com/Limited-Warranty.aspx
Figure 10. SCS 770065 Verication Tester
Specifications
Power
Power Adapter
100-240VAC
50-60 Hz
Output: 12 VDC @ 1.5 A
Output Plug Polarization:
Center Positive
Output Plug: 5.5 mm O.D. x
2.1 mm I.D. x 9.5 mm L
Operator
Wrist Strap Dual-Wire
Amount Monitored 2
Resistance Limit 1.5 megohms to 10 megohms
Body Voltage Limit ±2.5 VDC
Test Voltage 0.40 V @ open circuit,
peak-to-peak
Test Accuracy ±10%
Worksurface Mat
Amount Monitored 1
Resistance Limit* 3.7 megohms
Test Accuracy ±10%
General
Alarm LEDs and buzzer
Alarm Response Time 500 ms
Dimensions
(Monitor)
0.85" x 2.40" x 2.60"
(22 mm x 61 mm x 66 mm)
Dimensions
(Operator Remote)
2.41" x .84" x 1.13"
(61 mm x 21 mm x 29 mm)
Operator Remote
Cable Length
7 ft. (2.1 m)
Weight
(Monitor)
0.14 lbs. (64 g)
Weight
(Operator Remote)
0.07 lbs. (32 g)
Country of Origin United States of America
*The worksurface must have a conductive layer such
as Dual Layer Rubber or Dissipative 3-Layer Vinyl with
conductive buried layers. SCS workstation monitors are
not recommended for use with homogeneous matting.
ANSI/ESD S20.20 requires the use of a surface
resistance meter for periodic verification of a
worksurface's resistance-to-ground (Rtg). Constant
monitors may not be used as a substitute for this
requirement.
/
